1. School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, China
2. School of Electrical Engineering, Chongqing University, Chongqing, China
3. School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, China
4. College of Electrical and Information Engineering, Hunan University, Changsha, China
5. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
6. Northwest Branch of State Grid Corporation of China, Xi'an, Shaanxi Province, China